REGULATION OF PHOTOSYSTEM-1 REACTION-CENTER FORMATION

A surprisingly high level of the CP1 membrane-bound apoprotein was fou nd through ELISA test in barley coleoptiles, compared with etiolated l eaves. Non-synchronous changes of the chlorophyll (Ch1) alpha and CP1 apoprotein contents were found in greening etiolated seedlings after b rief preirradiation, in green leaves after continuous darkness and the second weak irradiation, and in old leaves after a period of darkness . The complexity of these findings gives a possibility of the CP1 apop rotein formation without direct connection to Ch1 alpha biosynthesis. The CP1 apoprotein accumulation in young etiolated leaves was stimulat ed by 5-aminolevulinic acid.